# All files / controllers DepartmentController.js

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     /**
     * Department Controller
     * Handles department management for tenants
     */

    const { pool } = require('../config/database');
    const { logger } = require('../config/logger');

    class DepartmentController {
      /**
       * Get all departments for tenant
       * GET /api/tenant/departments
       */
      static async getDepartments(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;

          if (!tenantId) {
            return res.status(400).json({ success: false, message: 'Tenant ID not found' });
          }

          const [departments] = await pool.execute(
            'SELECT id, tenant_id, name, description FROM departments WHERE tenant_id = ? ORDER BY name ASC',
            [tenantId]
          );

          logger.info(`Departments listed for tenant ${tenantId}`, { count: departments.length });

          res.json({
            success: true,
            data: departments
          });
        } catch (error) {
          logger.error('Error listing departments', { error: error.message });
          res.status(500).json({ success: false, message: 'Internal server error' });
        }
      }

      /**
       * Get single department
       * GET /api/tenant/departments/:id
       */
      static async getDepartment(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;
          const { id } = req.params;

          if (!tenantId) {
            return res.status(400).json({ success: false, message: 'Tenant ID not found' });
          }

          const [departments] = await pool.execute(
            'SELECT id, tenant_id, name, description FROM departments WHERE id = ? AND tenant_id = ?',
            [id, tenantId]
          );

          if (departments.length === 0) {
            return res.status(404).json({ success: false, message: 'Department not found' });
          }

          res.json({
            success: true,
            data: departments[0]
          });
        } catch (error) {
          logger.error('Error getting department', { error: error.message });
          res.status(500).json({ success: false, message: 'Internal server error' });
        }
      }

      /**
       * Create new department
       * POST /api/tenant/departments
       * NOTE: This method should be called AFTER checkResourceLimit('departments') middleware
       */
      static async createDepartment(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;
          const { name, description } = req.body;

          if (!tenantId) {
            return res.status(400).json({ success: false, message: 'Tenant ID not found' });
          }

          if (!name) {
            return res.status(400).json({ success: false, message: 'Department name is required' });
          }

          // Check if name exists
          const [existing] = await pool.execute(
            'SELECT id FROM departments WHERE name = ? AND tenant_id = ?',
            [name, tenantId]
          );

          if (existing.length > 0) {
            return res.status(400).json({ success: false, message: 'Department name already exists' });
          }

          // Create department (limit already checked by middleware)
          const [result] = await pool.execute(
            'INSERT INTO departments (tenant_id, name, description) VALUES (?, ?, ?)',
            [tenantId, name, description || null]
          );

          // Get created department
          const [departments] = await pool.execute(
            'SELECT id, tenant_id, name, description FROM departments WHERE id = ?',
            [result.insertId]
          );

          logger.info(`Department created for tenant ${tenantId}`, { departmentId: result.insertId, name });

          res.status(201).json({
            success: true,
            message: 'Department created successfully',
            data: departments[0]
          });
        } catch (error) {
          logger.error('Error creating department', { error: error.message });
          res.status(500).json({ success: false, message: 'Internal server error' });
        }
      }

      /**
       * Update department
       * PUT /api/tenant/departments/:id
       */
      static async updateDepartment(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;
          const { id } = req.params;
          const { name, description } = req.body;

          if (!tenantId) {
            return res.status(400).json({ success: false, message: 'Tenant ID not found' });
          }

          if (!name) {
            return res.status(400).json({ success: false, message: 'Department name is required' });
          }

          // Check if department exists
          const [existing] = await pool.execute(
            'SELECT id FROM departments WHERE id = ? AND tenant_id = ?',
            [id, tenantId]
          );

          if (existing.length === 0) {
            return res.status(404).json({ success: false, message: 'Department not found' });
          }

          // Check if name exists (excluding current department)
          const [nameCheck] = await pool.execute(
            'SELECT id FROM departments WHERE name = ? AND tenant_id = ? AND id != ?',
            [name, tenantId, id]
          );

          if (nameCheck.length > 0) {
            return res.status(400).json({ success: false, message: 'Department name already exists' });
          }

          // Update department
          await pool.execute(
            'UPDATE departments SET name = ?, description = ? WHERE id = ? AND tenant_id = ?',
            [name, description || null, id, tenantId]
          );

          // Get updated department
          const [departments] = await pool.execute(
            'SELECT id, tenant_id, name, description FROM departments WHERE id = ?',
            [id]
          );

          logger.info(`Department updated for tenant ${tenantId}`, { departmentId: id, name });

          res.json({
            success: true,
            message: 'Department updated successfully',
            data: departments[0]
          });
        } catch (error) {
          logger.error('Error updating department', { error: error.message });
          res.status(500).json({ success: false, message: 'Internal server error' });
        }
      }

      /**
       * Delete department
       * DELETE /api/tenant/departments/:id
       */
      static async deleteDepartment(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;
          const { id } = req.params;

          if (!tenantId) {
            return res.status(400).json({ success: false, message: 'Tenant ID not found' });
          }

          // Check if department exists
          const [departments] = await pool.execute(
            'SELECT name FROM departments WHERE id = ? AND tenant_id = ?',
            [id, tenantId]
          );

          if (departments.length === 0) {
            return res.status(404).json({ success: false, message: 'Department not found' });
          }

          // Check if department has users
          const [users] = await pool.execute(
            'SELECT COUNT(*) as count FROM users WHERE department = ? AND tenant_id = ?',
            [departments[0].name, tenantId]
          );

          if (users[0].count > 0) {
            return res.status(400).json({
              success: false,
              message: 'Cannot delete department with assigned users'
            });
          }

          // Delete department
          await pool.execute(
            'DELETE FROM departments WHERE id = ? AND tenant_id = ?',
            [id, tenantId]
          );

          logger.info(`Department deleted for tenant ${tenantId}`, { departmentId: id });

          res.json({
            success: true,
            message: 'Department deleted successfully'
          });
        } catch (error) {
          logger.error('Error deleting department', { error: error.message });
          res.status(500).json({ success: false, message: 'Internal server error' });
        }
      }
    }

    module.exports = DepartmentController;